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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 259

post #3871 of 10586

Hi Oskari,

 

It was a business relationship where Matsushiita got technology from Phillips, and in exchange Matsushiita/National offered Phillips business and organizational advice.


Edited by mordy - 11/8/13 at 12:50pm
post #3872 of 10586
Quote:
Originally Posted by TrollDragon View Post
 

post #3873 of 10586

This is the Voskhod symbol - no fire.Voskhod

post #3874 of 10586
Quote:
Originally Posted by mordy View Post
 

This is the Voskhod symbol - no fire.Voskhod

That is correct mordy for $200.00 lol

post #3875 of 10586

Here is connections for octal 6SL7GT as driver. It is pretty simple. No need to worry shield wirings.

 

700

post #3876 of 10586
Quote:
Originally Posted by Oskari View Post
 

 

In the interest of making amends, I offer you another piece of my greater knowledge, as you so eloquently put it. Matsush¡ta was making tubes using Philips technology long before Philips ceased tube production in Europe. What do you make of that?

 

Yo, Oskari, these things are sent to confuse/try us tube-rollers, of this I am certain!

My RCAs have serial numbers 7643 &7504, with seams atop the tubes - safe to assume "Amperex" version?

post #3877 of 10586

A Tung-Sol 6SL7GT arrived in today's mail. And it is BIG! lol

 

Compared to the 6DJ8-type tubes, these are not all that expensive. This tube cost me $16.00. 

 

 

Also, a few days ago, I received a 6SL7 to 9-pin adapter. A Sylvania 5751/12AX7 gives you some idea of the size of this tube plus adapter....

 

 

I configured my breadboard 9-pin socket for 12AX7 and turned it on!

 

 

And it sounds good! :)

 

In addition to this 6SL7, I have three 5751/12AX7: Tung-Sol, GE and Sylvania, so will be spending some time with these four tubes over the next several days

post #3878 of 10586
Quote:
Originally Posted by gibosi View Post
 

A Tung-Sol 6SL7GT arrived in today's mail. And it is BIG! lol

 

 

I'm glad that someone else is listening octal too.

 

I have been listening octals intensively (yes these crappy russian ones). And played skyrim many hours with these too... I'm very sorry to say this, but i think going to octals from miniatyres is same thing as it was going to 12AX7 and 6DJ8 from B7G tubes.

 

Octals have more dynamics, better control of everything, better instrument separation and details. These just have more power to do things right. And yet still i have only crappiest tubes of octals. I tried little 6N6P-IR's with the best of my 7pin miniatyres and i really wonder how bad they could sound after octals. They sound flat, soft and dull. :confused_face:

 

I'm waiting really anxious for those better tubes.:dt880smile: 

post #3879 of 10586
Quote:
Originally Posted by hypnos1 View Post
 

My RCAs have serial numbers 7643 &7504, with seams atop the tubes - safe to assume "Amperex" version?

 

The seams and the shape of the tip pretty much tell the story. See photo below.

 

Those numbers are YYWW date codes. I suppose it's the date of the RCA silk-screening.

 

Quote:
Originally Posted by Audiofanboy View Post
 

post #3880 of 10586
Quote:
Originally Posted by mordy View Post
 

It was a business relationship where Matsushiita got technology from Phillips, and in exchange Matsushiita/National offered Phillips business and organizational advice.

 

Yeah, the technology transfer didn't happen by Philips dumping its old disused machinery to Matsush¡ta when getting out of the receiving tube business.

post #3881 of 10586
Quote:
Originally Posted by Artsi View Post
 

I'm glad that someone else is listening octal too.

 

I have been listening octals intensively (yes these crappy russian ones). And played skyrim many hours with these too... I'm very sorry to say this, but i think going to octals from miniatyres is same thing as it was going to 12AX7 and 6DJ8 from B7G tubes.

 

Octals have more dynamics, better control of everything, better instrument separation and details. These just have more power to do things right. And yet still i have only crappiest tubes of octals. I tried little 6N6P-IR's with the best of my 7pin miniatyres and i really wonder how bad they could sound after octals. They sound flat, soft and dull. :confused_face:

 

 

Well, I would not go so far as to say that this Tung-Sol 6SL7 is better than a 6922/E88CC, but it is first-class. I am listening to Holly Cole's Night (Amazon), and her voice is deliciously sultry. I would say that this tube sounds something like a Mullard 6DJ8, quite warm, a clean, well-defined top-end, and a nice sense of air, but not as much treble presence as the US Amperex 6922.

 

I encourage those of you who are able to roll 12AX7 tubes to try one of these. I think you will be very pleasantly surprised. :)

 

Edit: I purchased the octal to 9-pin adapter here:

http://www.ebay.com/itm/320659633166?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649


Edited by gibosi - 11/9/13 at 12:44pm
post #3882 of 10586
Quote:
Originally Posted by gibosi View Post
 

 

Well, I would not go so far as to say that this Tung-Sol 6SL7 is better than a 6922/E88CC, but it is first-class. I am listening to Holly Cole's Night (Amazon), and her voice is deliciously sultry. I would say that this tube sounds something like a Mullard 6DJ8, quite warm, a clean, well-defined top-end, and a nice sense of air, but not as much treble presence as the US Amperex 6922.

 

I encourage those of you who are able to roll 12AX7 tubes to try one of these. I think you will be very pleasantly surprised. :)

 

Thank you gibosi! Please keep claiming the superiority of 6DJ8 tubes and keep trying to convince me to not try yet another whole family -let alone a whole new socket type- of tubes, my wallet might just give out if I do lol!

 

Jokes aside, I'm inclined to believe that the best of the late 50s and 60s miniature types should at least be solid rivals for the -comparably- old world octals; at least I'd like to think so...

 

Speaking of god tier double triodes, I finally got my US made Amperex USN-CEP 6922 tube (I have two more coming, one "USN" made in '62 and another USN-CEP made in 65-08) made in 64-52 and datecoded *4J just like gibosi's. Unlike the vision of New York in the winter of '61 in the latest Coen brothers' movie, this tube look like the best to come out of a NY factory for Xmas of '64. Gold pins, extra solid and rugged construction, this tube would make you wish you were actually in the Navy tuning radios in the 60s or something, just to get to try some nice tubes lol.

 

Of course, it sounds absolutely fantastic, but you already knew that right? Detail, holographic musicians, transparent as air, balanced, punchy as can be: this tube is a riot to itself! Still, while I gave it the obvious upper hand on the Orange Globes in the first 20 minutes of listen, I have to admit that after an hour or two, this tube made me realize just how great and musical the OGs also are.

 

While the USN-CEP might get a 9/10 or more on a hypothetical scale (with 10 being the legendary unobtainable tubes), the OGs would critically get a 8.9/10, so ever so slightly below but so close you wouldn't know otherwise. But on a subjective level, the OG have this warm yet transparent yet musical yet detailed characteristic to them that makes them hard to forget. As a tradeoff, the US 6922 seem like more serious tubes with punchier bass and a -slightly- drier midrange. Treble, while different is great in both cases. Actually, I think I've only just realized the meaning of the word "sweet" used to describe treble, comparing these two tubes. The OG treble is definitely sweet, it just has a delicious quality to it that makes you grin; the USN 6922 treble is more SS-like and serious sounding; detail is about the same in both case (8.9 and 9/10, or whatever). Bourbon & ginger ale or a chilled premium Chablis, which should I choose???

 

So, no, the OG isn't going anywhere yet, and yes, you need to try one of the best Amp'ex tubes out of each Holland and the US. They're just that good! Again, I'm not even rolling tubes anymore, I'm just listening to music -at long last!

post #3883 of 10586

As good as the US-Amperex 6922 is, I have also noticed that it lacks some of the sweetness of the BugleBoys, and I have been thinking that I would like to pick up a pair of Holland-Amperex 6922. Perhaps they might be just a little sweeter? I do feel quite certain, after spending some quality time with my Hamburg-Valvo 6922, that I am not interested in further exploring the Telefunken / Siemens end of the "European Sound Continuum"...  lol  

 

However, I am in no hurry, as the US-Amperex is by far the best tube I have. and eventually, a good deal on a Holland tube will pop up. But I did find a good deal on a La Radiotechnique 6922/E88CC, made in Suresnes, France, with the factory code F. From what I have read, this tube could be quite nice....

post #3884 of 10586
Is the 6SL7GT a good driver to start with?
post #3885 of 10586
Quote:
Originally Posted by TrollDragon View Post

Is the 6SL7GT a good driver to start with?

 

I'm not sure what you mean by "start with". Where are you going? :)  

 

The Tung-Sol 6SL7GT I have is not bad. However it is quite bassy and warm, and lacking in details, transparency and sound stage. Even so, its actually quite fun to listen to and it was cheap. I bought it primarily to see if I could actually use a 6SL7 in the LD.

 

From what I have read, one of the best of this breed is the Tung-Sol JAN CTL 6SU7GTY with black glass, black round plates and a brown base. The 6SU7 is a premium version of the 6SL7. Unfortunately, while not as expensive as the premium 6DJ8, these are not cheap. So if I decide to get another, this is what I will try to find... at a good price....

 

$T2eC16dHJG!FFm1ltomkBSeU2sdSI!~~60_57.JPG 


Edited by gibosi - 11/9/13 at 7:54pm
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